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Showing 1 to 20 of 55 for “"phosphine oxide"”.
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Synthesis and Characterization of Phosphine Oxide Containing Monomers and of the Flame Resistant Polymers Prepared Therefrom
… monomers, principally monomers containing aryl phosphine oxide units. Utilization of these monomers was demonstrated in various types of linear and network polymerizations. The diamines monomers included bis(3-aminophenyl) methyl phosphine oxide (DAMPO), bis(3-aminophenyl) phenyl phosphine oxide …
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Synthesis and Characterization of Aryl Phosphine Oxide Containing Thermoplastic Polyimides and Thermosetting Polyimides with Controlled Reactivity
… containing monomers, bis(3-aminophenyl)methyl phosphine oxide (m-DAMPO) and bis(3-aminophenyl)phenyl phosphine oxide (m-DAPPO), were synthesized and incorporated into a thermoplastic poly(arylene ether imide) based upon 2,2'-bis[4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride and …
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Synthesis and Characterization of New Aryl Phosphine Oxide and Ketone Containing Poly(arylene Sulfide Sulfone)s
… sulfone (DCDPS), sodium hydrosulfide, sodium hydroxide, sodium acetate, and deionized water, in NMP at elevated reaction temperatures and pressure. The effect of these variations, e.g., reaction temperatures and times, molar ratios of H2O-to-NaSH, NMP-to-H2O, etc. were investigated. Optimized …
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Synthesis and Application of Air-Stable Secondary Phosphine Oxide, Oxime, and Amine-Phosphine Palladium(II) Complexes in Transfer Hydrogenation and Cross-Coupling Reactions
… (R3P)Pd(amine)Cl2, using di-tert-butylneopentylphosphine and trineopentylphosphine. Under optimized conditions, the precatalysts were effective for the Buchwald-Hartwig amination of aryl bromides and aryl chlorides. We discovered that the identity of the amine ligand significantly impacts …
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Polydimethylsiloxane Containing Block Copolymers: Synthesis and Characterization of Alternating Poly(Arylene Ether Phosphine Oxide)-B-Siloxane and Segmented Nylon 6,6 -B-Siloxane Copolymers
… copolymers were alternating poly(arylene ether phosphine oxide)-poly(dimethylsiloxane) systems, prepared via oligomeric silylamine-hydroxyl reactions. Secondly, segmented nylon 6,6-poly(dimethylsiloxane) block copolymers were synthesized via a non-aqueous adaptation of the "nylon 6,6 salt" …
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Synthesis and characterization of phosphorus containing poly(arylene ether) systems
… of poly (arylene ether) s containing the phosphine oxide unit along the backbone were investigated and unique properties derived from the presence of this moiety were identified. The preparation of crucial phosphine oxide containing monomers which would be susceptible to the desired …
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Synthesis and characterization of novel bismaleimides derived from arylene phosphine oxides and ether-ketones
Bismaleimides containing either bisphenoxy phosphine oxide or bisphenoxy carbonyl linkages have been synthesized in high yields from bis(4-fluorophenyl) phenyl phosphine oxide or para-[bis(4-fluorobenzoyl) ]benzene via a two step process. The respective activated aryl halides were first reacted …
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Synthesis and characterization of high performance polymeric materials: poly(arylene ethers), polyamides, polyesters and liquid crystalline polyarylates
… hydrolysis of the dihalide using potassium hydroxide in aqueous dimethyl sulfoxide followed by silylation with hexamethyl disilazane. Both linear and star-branched structures of PAEs were synthesized and this polymerization route allowed both random and block copolymers to be prepared. Triaryl …
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Monomer synthesis and polymer pyrolysis
… of polymer systems containing the phosphine oxide unit as an integral part of the backbone continue to be areas of active research. To date the majority of research activity has centered on the synthesis and features of poly(arylene ether phosphine oxide) (PEPO). All PEPOs gave …
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Phosphorus-Containing Polymers, Their Blends, and Hybrid Nanocomposites with Poly(Hydroxy Ether), Metal Chlorides, and Silica Colloids
… been shown that bisphenol A poly(arylene ether phosphine oxide/sulfone) homo- or statistical copolymers are miscible with a bisphenol A-epichlorohydrin based poly(hydroxy ethers) (PHE), as shown by dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC), infrared …
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Synthesis of Functionalized Polysiloxanes and Investigation of Highly Filled Thermally Conductive Microcomposites
… of novel polyorganosiloxanes with pendent phosphine, phosphine oxide, nitrile and carboxylic acid moieties. Such polysiloxanes were prepared with controlled concentrations of both the polar moieties and hydrido or vinyl pendent crosslinkable sites to afford precursor materials for …
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The Effect of Chemistry and Network Structure on Morphological and Mechanical Properties of Diepoxide Precursors and Poly(Hydroxyethers)
… prepared with blends of bisphenol-A and novel phosphine oxide based diepoxide oligomers using a siloxane or a novolac crosslinking agent. In the siloxane cured networks the incorporation of the phosphine oxide group yielded networks with increased glass transition temperatures, from 71°C to …
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Synthesis and characterization of novel macromolecules/networks via side chain modifications of amorphous poly(arylene ethers)
… A new monomer, 3-aminophenyl-bis(4-fluoro phenyl)phosphine oxide was prepared by nitration and reduction of bis(4-fluoro phenyl)phenylphosphine oxide. Statistical incorporation of pendant aryl amines into linear polymers was achieved by copolymerization of the …
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Unsymmetrical tridentate phosphine ligands
… synthetic route, via phosphonium salts and phosphine oxides has been developed for the preparation of unsymmetrical triphosphine ligands, which necessarily contain one central chiral phosphorus atom. The ttparent" tridentate phosphine is (2- diphenylphosphinoethyl)(3-diphenylphosphinopropyl) …
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Synthesis and Characterization of Phosphorus Containing Poly(arylene ether)s
… It was determined that by incorporating the phosphine oxide moiety into the polymer backbone certain properties of the resulting poly(arylene ether)s were substantially improved, such as an increase in T<sub>g</sub>, thermal stability in air, modulus, and char yield, compared with control …
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High Performance Disulfonated Poly(arylene Sulfone) Co- and Terpolymers For Proton Exchange Membranes For Fuel Cell And Transducer Applications: Synthesis, Characterization And Fabrication Of Ion Conducting Membranes
… percent disulfonated poly(arylene ether phenyl phosphine oxide diphenyl sulfone) terpolymer-heteropolyacid (HPA) composite membranes and membrane electrode assemblies were chosen for detailed investigation. A series of 45 mole percent disulfonated biphenol-based poly(arylene ether phenyl …
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Functionalised metal nanoparticles as novel reagents for biomedical analysis.
… -selenolate compounds bearing a phosphonium (or phosphine oxide) head group, and the applications as ligands for the stabilisation of gold nanoparticles. The ability of these cationic phosphonium gold nanoparticles as substrates for the detection of negatively charged biomolecules has also been …
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Synthesis and characterization of phenylethynyl endcapped polyetherimide oligomers
… The diamine monomer bis(m-aminophenyl) methyl phosphine oxide (DAMPO) was synthesized via nitration and the reduction of diphenyl methyl phosphine oxide. Rigorous purification of this monomer enabled it to be used for the synthesis of high molecular weight polyetherimides. Both thermoplastic …
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Chiral Organometallic osmium(VI) Nitrido Complexes
… aldehydes and ketones respecively. The bidentate phosphines dppe and (S,S)-CHIRAPHOS bind with the Os-Cr heterobimetallic complexes. Exposure to oxygen allows the chromium to oxidize the phosphine ligand producing phosphine oxide and the starting heterobimetallic complex.
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